AirHint found the following cheapest return flights from Boston (BOS) to San Jose (SJO) in January 2026 (see full year).

Return flights

21 Jan - 28 Jan	Spirit Airlines
21 Jan - 07 Feb	Spirit Airlines
16 Jan - 23 Jan	Copa
11 Jan - 19 Jan	Copa
09 Jan - 19 Jan	Copa
21 Jan - 05 Feb	Spirit Airlines
11 Jan - 28 Jan	Spirit Airlines
08 Jan - 28 Jan	Spirit Airlines
07 Jan - 14 Jan	Copa
21 Jan - 23 Jan	Spirit Airlines
09 Jan - 28 Jan	Spirit Airlines
21 Jan - 09 Feb	Spirit Airlines
07 Jan - 28 Jan	Spirit Airlines
16 Jan - 05 Feb	Spirit Airlines

Also check the deals for one-way flights from Boston to San Jose in January.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Boston to San Jose in January from 261€

Return flights